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Oil displacement method for high-temperature high-salt oil reservoir

An oil displacement method, a high-temperature and high-salt technology, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc., can solve the problems of alkali corrosion, poor oil displacement efficiency, and high use concentration in ASP flooding. The effect of reducing interfacial tension, high salinity resistance, and enhanced oil recovery

Active Publication Date: 2013-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the oil displacement agent containing surfactant in the prior art has poor oil displacement efficiency under high temperature and high salt conditions, high use concentration and corrosion and damage caused by alkali in ASP flooding to formation and oil well. Scale damage problem, providing a flooding method for high temperature and high salinity reservoirs

Method used

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  • Oil displacement method for high-temperature high-salt oil reservoir
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  • Oil displacement method for high-temperature high-salt oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Synthesis of chloropentyl (R=5) phenol polyoxyethylene (n=2) ether

[0031] Add 100g of pentyl (R=5) phenol polyoxyethylene (n=2) ether and 57g of pyridine into a four-necked round-bottomed flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, and heat to 70 under stirring. °C, slowly add 85 g of thionyl chloride dropwise with a dropping funnel, and react at 90 °C for 10 hours after the dropwise addition is completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and obtain the intermediate product chlorine after drying. Substituent amyl (R=5) phenol polyoxyethylene (n=...

Embodiment 2

[0039] Synthesis of Nonyl (R=9) Phenol Polyoxyethylene Ether (n=10) Sodium Carboxylate Betaine

[0040] 1) Synthesis of Chlorinated Nonyl (R=9) Phenol Polyoxyethylene (n=10) Ether

[0041] Add 100g of nonyl (R=9) phenol polyoxyethylene (n=10) ether and 22g of pyridine into a four-neck round bottom flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, and heat to 70 32.5 g of thionyl chloride was slowly added dropwise with a dropping funnel, and reacted at 70°C for 8 hours after the dropwise addition was completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and obtain the inter...

Embodiment 3

[0049] Synthesis of Sodium Carboxylate Betaine of Dodecylphenol Polyoxyethylene Ether (n=20)

[0050] 1) Synthesis of chlorinated dodecylphenol polyoxyethylene (n=20) ether

[0051] Add 100g of dodecylphenol polyoxyethylene (n=20) ether and 13g of pyridine into a four-neck round bottom flask equipped with a reflux condensing device, a thermometer, a stirrer and a gas absorption device, heat to 60°C under stirring, and use 18.7 g of thionyl chloride was slowly added dropwise into the dropping funnel, and reacted at 80° C. for 10 hours after the dropwise addition was completed. After the reaction, the reactants were left to stand, cooled and separated into layers. The upper organic phase was the target product, and the lower layer was solid pyridinium hydrochloride. Use 30% sodium hydroxide solution to neutralize the upper organic phase to neutral or weakly alkaline, separate the inorganic salt, then wash the upper organic phase with hot saturated saline for 5 to 6 times, and o...

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Abstract

The invention relates to an oil displacement method for high-temperature high-salt oil reservoir, and mainly solves problems existing in surfactant-containing oil displacement agents in the prior art. The problems relate to poor oil displacement efficiency under the conditions of high temperature and high salt, high usage concentration as well as the stratum and oil well's corrosion and incrustation caused by alkali generated from the ternary composite oil displacement. By the oil displacement method for high-temperature high-salt oil reservoir, underground dehydrated crude oil contacts with an oil-displacement composition to fully displace the crude oil in the central of rocks under the alkali-free condition and when the temperature for oil displacement is greater than or equal to 65 DEGC, the total salinity of water is 10000-35000mg / L and Ca<2+>+Mg<2+> is 0-1200mg / L. Therefore, the method provided by the invention is utilized to greatly solve the problems and can be applied in the tertiary oil recovery production in oil fields. The oil-displacement composition comprises the following components of: by weight, (1) 0.01-5.0% of an alkylphenol polyoxyethylene carboxylate betaine surfactant; (2) 0.01-3.0% of a polymer; and (3) 92.0-99.98% of water.

Description

technical field [0001] The invention relates to an oil displacement method for high-temperature and high-salt oil reservoirs. Background technique [0002] With the development of society and economy, petroleum, as a non-renewable resource, is becoming more and more precious. The problems we are facing are: first, the contradiction between supply and demand is prominent, the demand for oil is getting bigger and bigger, and new oil fields are getting fewer and fewer; second, there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can produce 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, primary oil recovery and secondary oil recovery only produce 25-50% of underground crude oil. In order to ensure the long-term stable supply of oil, it is necessary to research and develop enhanced oil recovery technology. Through enhanced oil recovery measures in terti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
Inventor 孙文彬张卫东袁明何秀娟王辉辉
Owner CHINA PETROLEUM & CHEM CORP
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